Bobbin-boring machine.



' L. G. BALDWIN & E. C. BUFPINGTON.

BOBBIN BORING MACHINE.

APPLICATION nun JULY 17, 1901.

Patented Nov..1,1910.

6 BHBETB-BHEET 1.

H mH INVENZ'UHE.

I HNEY.

fim? M20 L. c. BALDWIN & E. 0. BUFFINGTON.

BOBBIN BORING MACHINE.

APPLICATION FILED JULY 17, 1907.

974,545. Patented 'No 1, 1910.

8 SHEETS-SHEET 2. I

L. G. BA LDWIN & E. O. BUFFINGTON.

BOBBIN BORING MACHINE.

APPLICATION FILED JULY 17, 1907.

Patented Nov. 1, 1910.

6 SHEETS-BEBE! 3.

INVENTUHE:

WITNESSES. @KMW L. G. BALDWIN & E. G. BUFFINGI'ON.

BOBBIN BORING MACHINE.

APPLICATION FILED JULY 17, 1907.

Patented Nov. 1,1910.

8 BHEETB-BHEBT 4.

I WITNESSES.

Patented Nov. 1,1910;

6 SHEETS-SHEET 6.

L. G. BALDWIN & E. 0. BUFFINGTON. 1201mm 1301mm momma.

APPLICATION IILED JULY 17, 1907.

w: 7x25525- 65mm a i L. G. BALDWIN & E. G. BUFFINGTON. BOBBIN BORINGMACHINE.

APPLICATION FILED JULY 17, 1907. 974 545, Patented Nov. 1,1910.

6 SHEETS-SHEET 6.

EIHNEY VENTURE.-

7447M AT! UNITED STATES PATENT OFFICE.

LUTHER C. BALDWIN, OF PROVIDENCE, RHODE ISLAND, AND EDWIN C.BUFFING'ION, H

01 MANCHESTER, NEW HAMPSHIRE, ASSIGNOBS TO U. S. BOBBIN & SHUTTLE CO.,OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF NEW JERSEY.

BOBBIN-BORING MACHINE.

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application filed July 17, 1907. Serial No. 884,269.

To all whom it may concern:

Be it known that we, LUTHER C. BALDWIN and EDWIN C. BUFFINGTON, citizensof the United States, residing, respectively, at'

' the construction of a bobbin boring machine whereby the successiveoperations of feeding the bobbin blanks to the machine, boring thebobbin blanks and ejecting the bored bobbins from the machine areperformed automatically.

A further object of our invention is to provide a'bobbin boring machinethat will bore shuttle or similar'bobbins more accurately than hasheretofore been done.

A still further object of our invention is to increase the production ofbobbin boring machines, thereby decreasing the cost of manufacturingbobbins for loom shuttles, spinning frames or similar machines.

Our invention consists in the peculiar and novel construction of anautomatic bobbin boring machine, said machine having a series of bobbinholders rotatably supported in a circle, means forgiving an intermittentmotion in a circular path to the bobbin holders, means for revolving thebobbin holders, means for receiving and locking a bobbin blank in thebobbin holders, means for automatically feeding bobbin blanks to thebobbin holders, a tool holder adapted to hold a series of drills ofvarying lengths in a circle, means for operating the tool holder toforce the drills centrally into the bobbin blanks, thereby giving aplurality of borings of varying depths to the bobbin blanks in oneoperation of the machine, means for automatically ejecting the boredbobbins from the bobbin holders, and details of construction, as will bemore fully set forth hereinafter and claimed.

The figures in the drawings are all shown with the operative parts inthe position they lines.

would assume at the beginning of one complete operation of the machine.

Figure 1 is a front elevation of the machine; showin the maindrivingbelt and the belt for riving the bobbin holders in broken lines.Fig. 2 is a sectional plan view taken on line 2 2 of Fig. 1, showing thecam shaft and the means for revolving and reciprocating the back shaftshowing various parts, such as the gears and cam drum in full lines.Fig. 3 is a vertical sectional view taken on line 3 3 of Fi 1, showinthe means of operating the bobbin blan locking mechanism in the bobbinholders.

Fig. 4 is a vertical sectional view taken on line 4 4 of Fig. 1, showingthe means for 'vlng an intermittent rotary motion to the obbin holderframe, the means for locking the bobbin holder frame and the belt fordriving the bobbin holders, shown in broken Fig. 5 is a verticalsectional view taken on line 5 50f Fig. 1, showing the circular toolholder and the means for guiding and giving a reciprocating motion tothe same. Fi 6 is a vertical sectional view taken on line 6 6 of Fi 1,showing the means for automatically Feedin the bobbin blanks to thebobbin holders. ig. 7 is an enlarged detail sectional view takenlengthwise through one of the bobbin holders and showing the bobbinblank locking mechanism in the open position for receiving abob- .binblank. Fi 8 is an enlar ed detail sectional view simllar to Fig. 7showin a bobbin blank locked in the bobbin hol er and the cam plate forunlocking the bobbin holder. Fig. 9 is an enlarged detail sectional viewtaken on line 9 9 of Fig. 3, showing the means of rigidly sup ortin thecam plate and the yoke for unloc in'g tfi blank locking mechanism in thebobbin holders. Fig. 10 is an enlarged detail view looking at thereceiving end of one of the bobbin holders. Fig. 11 is a sectional viewtaken lengthwise through a bobbin blank, and Fig. 12 is a sectional viewsimilar to Fig. 11, showing the completed boring in the bobbin withtransverse lines indicating the successive borings which the bobbinblanks may undergo in one operation of the machine.

In the drawings, a indicates the frame of the machine, b the drivingpulley, o the drive bobbin h d ram I t biniholder frame operating arm, kthe binholderframe i bobbin-holderoperating mechanism fbobbinholder 1818 u holding the supporting j shown in Figs. 2

' An arm 28, having a a position for the roll groove 27 in the cam 26and for the semisecured at A central hub 34 for rotatably sn 7 same onthe the fixed su rting bar, f l bobbin holde locking mechanism, Z the mthe unlocking cam, 42. the hopper, 0 the bobbin blank feed mechanism, 32the tool holder, .1- ;the tool holder operating mechanism, athechargingrod, tthe delivery trough, 'ua 'bobbinblank and 1', 2, 3, 4,5, 6, I, 8, 9-and 10 drills of varying lengths s'e- 'ur'ed in the toolholder. v i

, The frame a consists of a bed 14 supported on-thelegs 15 15 andsupporting the end bracket 16 having a bearing 17 for the outer end ofthe driving shaft 0, the end sup orts bar and havin earings. for thedriving shaft 0, the cam s aft d and the back shaft e, the bearings 19for the inner end of the back shaft e and the guide sup orts 20 20having the guide ways 21 21 or the tool holder 3),- as

1, 2 and 5.

The driving shaft 0 has the driving pulley b and a pinion 22 meshingwith a gear 23 on the cam shaft (1, and a ear 24 on the cam shaft dmeshes with a 'wi e-faced pinion 25 on the back shaft e, as shown inFigs. 1 and 2. A cam 26 havinga cam groove 27 in its periphery issecured to the cam shaft (1. roll 29, a semi-circular end 30 and atransverse hole 31 in the opposite end for the back shaft 0, is heldagainst on the back shaft 0 the shaft 6, and in 29 to enter the camlongitudinal movement by the collars 32 32 on circular end 30 of the armto engage witlnthe peripheral face of the cam 26, as shown in ig .2and6.7 The supporting bar f extends centrally lengthwise above the bed' 14and is rigidly each end .in the top of the end supports 18 18,- as shownin Figs. 1 and 3. The bobbin holder frame g consists of twocircular-frame members 33 33 each having a porting the bar f, a series 0preferabl twelve bearings 35 35 formed in a circle ad jacent theperiphery of the members at equal distances apart and parallel withthe-bar f and a series of twelve intermediate slots 36 36 extendingradially inward from the periphery of the members at equal distancesapart, as shown in Figs. 1 and 4'. The frame members 33 33 of the frameg are secured rs,z' the bobtubularportion 41 bobward 37 is constructedto have a tubular portion 41 and a solid portion 42. The end of the isshaped to have an in-v ternalannular' li 43 for grasping the large endof a bobbin blank and an external annular flange 44. Theend is split'ina predetermine distance spring members which are sprung outward, asshown in Fig. 7. A centering block 45 in the tubular portion. 41 isconstructed to have a cone-sha ed cavity 46 in itsv forward end for thesma coiled, spring 47 in the tubular portion 41. is intermediate thecentering block 45 and the solid portion '42" of tends outward from theframe 5 and carries a sleeve 48 held from 1011 'tu inal movement bycollars 49 49 secure to the bar 40. A stud'50 is secured to, theadjacent frame member 33 and extends outward under and parallel with thebar 40. A slide 51 on the stud is constructed to have anupwardlyextending yoke v52, the arms of which are secured to the sleeve48 on the bar 40, fingers 53 53 on the yoke whichextend outparallel withand slightly beyond the end of the bar40 and a rol tom of the slide in aposition to en age with the cam plate m, as shown in igs. 7, 8

and 9.

The bobbin holder frame operating armz' has a roller 55' on its free endand is secured to the back shaft ein a position for the roller to enterone of the radial slots 36 in the bobbin holder frame, as shown in Fig.4,

(when the arm is in its operative position) and rotate the bobbin holderframe onetwelfth of a revolution. a

The bobbin holder frain anism It consists of a cam 56 secured to the camshaft 03 andhaving a cam groove 57 in the bar 40 which ex- I or 54 onthe bot- 1 end of a bobbin blank. A

locking mechits face, a lever 58- pivotally secured adjacent the cam toa bracket 59 rigidly secured to the bed 14, said lever 58 having aroller 60 on its inner end engaging with the cam groove 57 in the cam 56and a slot 61 in its outer end, a slide 62 in the bracket 59 having aroller 63 engaging with the lever 58 through the slot 61, and aprojection 64 in a position to enter one of the radial slots 36 36 inthe bobbin holder frame, as shown in Figs. 1 and 4.

The bobbin holder operating mechanism Z consists of .a cam 65 having "acam groove 66 and secured to the cam shaft d, an arm 67 having a roller68 engagin with the cam groove 66 in the cam 65, a rod 69 secured at itslower end to the arm 67 and supported in a vertical position in guideson the adj aoent end support 18, a bell crank lever 70 having an arm 71pivotally secured to the upper end of the rod 69, a flattened arm 72which engages with'the ends of the fingers 53 53 on the yoke of theslide 51 and pivotally secured to a bracket 73. This bracket 73 is tothe supporting bar f, as shown ln F The bobbin holder unlocking cam mconsists of a cam plate 7 having-the cam surface 76 set at an angle tothe plate, as shown in Fig. 8. This cam plate 75 is rigidly secured tothe disk 74 1n a position for the roller 54 on the slide 51 to en agewith the cam surface 76, as shown in F ig. 9, when a bobbin holder 7:,has reached its delivery position. I

The hopper n consists of a hollow receptacle 77 open at the to andshaped to ho d a plurality of bobbin b anks in a horizontal position,one above the other, as shown in broken lines in Fig. 6. An opening 78is formed in the hopper at the bottom of the same and the ho per issecured to a bracket 79 which is rigi ly secured to the to of the backguide sup ort 20, as shown in li ig. 6.

The bobbin lank feed mechanism 0 consists of a sprocket 80 on the camshaft (2, a sprocket 81 secured to a shaft 82 rotatably supported in abearing 83 on the back guide support 20, a sprocket chain 84 connectingthe sprockets 80 and 81, a cam 85 on the shaft 82, a rod 86 having aroller 87 on its lower 'end and reciprocally supported in guides on theback guide support 20 in a position for the roller 87 to engage with thecam 85, a bell crank lever 88 pivotally secured 'to the bracket 79 andhaving an arm 89 pivotally secured to the upper end of the rod 86,.andan arm 90 pivota 1y secured to :a slide 91 having an L-shaped forwardend 92 and reciprocally supported in the bracket 79 in a position tomove horizontal] through the openin 78 in the hopper an carry a bobbinblan from the hop er to the charging position, as shown in bro en linesin Fig. 6, with the charging point indicated by the arrow '10. I

The tool holder 72 'consists of a circular frame having a central hub 93for reciprocally su porting the holder on the bar (f, 'oppodtey-disposed guides 94 94 in the gui e ways 2121 ofthe guide supports 2020, and

a series of twelve clamps 95 95 placed at equal distances apart on theperiphery of the holder and in a position to brin drills in 'alinementw1th the center 0 the bobbin holders h h, as shown in Figs. 1 and 5. Theupper back clamp 95, which is number twelve clamp, holds the chargingrod 8 in alinement with the char mg point, as indicated bythe arrow 10in ig. 6, and the drills are held in succession in, the clam s,

starting with the short number 1 drill in t 6' back ,number' one clamadjacent to the char 'ngfrod a and -en mg withthe long num er 10 drillin the tenth clamp on the front. The eleventh clamp, which comes apthearrow X in Fig. 6, is left blank or may be eliminated.

consists of a cam drum 96 secured to the cam shaft 03 and having a camgroove 97 in its face, a bracket 98 rigidly secured to the bed 14, alever 99 pivotally secured at its center to the bracket 98 and having aroller 100 on its lower end engaging with the cam groove 97in the camdrum 96 and a forked upper links 102 102 ivotall connected to the forkedupper en 101 o the lever 99 and to the hub 93 of the tool holder p, asshown in Figs. 1 and 5.

The delivery trough t is secured to the tool holder ;0 in a osition forthe inner end to receive the bore bobbins from the bobbin Fig. 6. Thetrough t extends at an angle shown in Fig. 1.

The bobbin blank 1; is in the form of a portion 104 and a small end 105,as shown m Fig. 11.

In the operation of our improved bobbin borin machine the driving ulleyb is revolved in the direction of t e arrow" by a belt as shown inbroken lines in Fig. '1, and the bobbin holders h It are revolved at acomparatively higher speed by a belt enga ing with the pulleys 39 39 onthe bobbin hoFders, as shown in broken lines in Figs. 1

driving shaft 0 through the pinion 22 and the gear 23 to revolve the camshaft d and the wide face inion 25 on the back shaft 6 to revolve theack shaft two revolutions to one of the cam shaft. The cam 26 actsthrough the arm 28 to reciprocate the back shaft 6 and move the bobbmholder frame operating arm 2' out'of its operative position for onerevolution andthen back into its operative position at the nextrevolution of the back shaft e, when the roll 55 on the armz' enters oneof the radial slots 36 in the bobbin holder frame 9 and revolves theframe by a quick movement one-twelfth of a revolution, thus bringinganopen bobbin holder 71. to the charging point, indicated by the arrow was shown in Fig. 6. The bobbin holder frame lockin mechanism is nowoperated through t ecam 57 on the cam shaft 03, and the lever 58 to movethe slide 62 upward and force the projection 65 on the slide intothe-adjacent radial slots 36 in the bobbin holder frame to hold theframe from rotating on the bar f. The bob? bin blank feed slide 91 isnow operated I the sprocket 81 on the shaft 82, the sprocket chain 84,the H1285, the rod 86, and the bobbin having a large end 103, acone-shaped through the sprocketv on the cam shaft d,,

The tool holder operating mechanism 1' end 101 straddling the bar f andtwo slde holders, when a holder has reached the de- I livery point, asindicated by the arrow'X in" downward to the end of the machine, as

and 4. Power is now transmittedfrom the.

through the gear 24 on the cam shaft and I ;br1ngs.the bobbin blank intoalmement the centerof the open bobbin holder. The. tool holder p is nowmoved toward the bobbellcrank inverse to carry a bobbin blank '1) onthe'L-shaped end.92'of the slide from the hopper n to. the charging oint, whttvh .binholders through the operation of the v cam 96 on the cam shaft(1, the lever 99 and the connecting links 102 102, when the chargin rod3' en aging with the lar e end 103 of t e bobbimbla 'v pushes the obbinblank into the open bd bin'holder 72.. As the the bobbin blank andsecurely locks the bob- .the centering '"---.-tension of t .the toolholder 12. This movement of the bar 40 brings the annular externalflange 44 on the split tubular end :of the bar into enagement with theinner face of the cones aped end 38 of the tube 37 which contracts thesplit end of the bar and forces the internal annular lip 43 onto thelarge end 103 of bin blankin the bobbin holder, as shown in Fig.8., Theslide 91, the slide 62, the charging rodps, and' -the bell cranklever-70-now return "to their original positions. In the .nextoperationof the machine a bobbin blank is inserted into the next bobbin holderand the first bobbin blank is given its first artial boring by the shortdrill indicated y the numeral 1 in Figs. 1 and 5. In the next operationa bobbin blank is inserted into the next bobbin holder, the first bobbinblank is iven its second artial boring by a slightly on er drill inicated by the nu- These 0 meral 2 in. ig. 5 and the second bobbin blankreceives'its first partial boring by the short drill indicated by thenumeral 1. rations are repeated until the first {bobbin lank has reachedthe longest drill 5 and has received ten boringls,

indicated by the numeral 10 in Figs. 1 and the 'last' boring given bnumber 10 dril finishing the bore of the bbin. In this position of the Imachine the first bobbin blank has received the tenth or finishedboring, the second bobbin blank has received nine borings, the

third bobbin blank has received eight bor ings" and so on to the tenthbobbin blank which has received its first'or initial boring.

- I bobbin holder In the next 0 eration .of the machine the having thenumber 1 bobbin is brought into the delivery position indi-. cated bythe arrow X in Fig. 6. -The roller 54 on the slide 51 engages with thecam surface 7,on the cam plate .7 5 moving the slide toward. the drivin.the bobbin. The bo bin is now ejected from the tension of the coiledspring 47 into t arenas outward through the yoke 52 and the sleeve48 onthe rod 40 moves the rod 40 pulley b, and releases the holder by thecentering block 45 through e trough at from which it may shde into are-. ce tacle, not shown. This leaves each of the b0 bin holders insuccession in an open position, as shown in Fig. 7, to receive a bobbinblank on the next operation of the machine. From this oint on a bobbinblank is fed into a bobbin older and a bobbin having a finished boringis ejected from 8. bob- I tion of the machine or or each revolution ofthe cam shaft (Z.

It is evident that an number of bobbin holders or drills could used andthat the structural details of the machine could be varied withoutmaterially affecting the spirit of our invention.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent:

1. In a bobbin boring machine, a rotatable frame having a plurality ofbobbin holders, a non-rotatable tool holder composed of a slidable framecarrying a lurality of drills, a charging rod earrie by said tool holderframe, means to feed bobbin blanks to a position between the front ofthe bobbin holders and the front end of said chargin r0d,means formoving said tool holder rame to bring said charging rod to engage abobbin blank and force the latter. into one of said bobbin holders, andmeans to rotate said bobbin holder frame.

2. In a bobbin boring machine, a horizontal shaft, a rotatable frame onsaid shaft, having a plurality of bobbin holders thereon, a slidabletool holder frame on said shaft carrying a plurality of drills, acharging rod carried by. said tool holder frame, meansto feed bobbinblanks to a position between the front of said bobbinholders and thecharging rod, a pair of shafts, .means actuated by one shaft to rotatesaid bobbin holder frame, means operated by the other shaft to actuatesaid first shaft and thereby said bobbin frame rotating means, means tolock said bobbin holder frame against rotation operated intermittentlyfrom said second shaft, and means to actuate said bobbin blank feed ingmeans from said second shaft.

3. In a bobbin boring machine, a rotatable frame having a plurality ofbobbin holders,

a non-rotatable slidable frame carrying a plurality. of drills, chargingmeans carried by said slidable frame, means for intermittently rotatingsaidbobbin holder frame, means for rotating said bobbinholders, meansfor feeding blanks in position to be engaged by said charging means toinsert a bobbin blank into one of the bobbin holders,

and means for actuating said slidableframe to simultaneously insert abobbin blank into one of the holders and to cause said drills to on agethe previously inserted blanks.

4. In a bobbin. boring machine, a rotatable frame carrying a pluralityof bobbin holders, means to intermittently move said frame in the arc ofa circle, means 'to' feed bobbin blanks to a position in, front of saidholders means to rotate said holders, combined chargin and drillingmeans to successively Insert a lank into each holder and to operate onthe previously inserted blanks, and means to move said combined means toand from said holders upon each partial rota-,

- tion of said frame.

5. In a bObblIl boring'machine, a rotatable frame carrying a pluralityof bobbin holders, means to intermittently move said frame in the arc ofa circle, means'to feed bobbin blanks to a position in front of saidholders, means to rotate said holders, a tool holding frame slidable' toand from said rotatable frame, means carried by said tool holding framefor enga ing a blank and feedin same to one of said bobbin holders uponeac forward movement of said tool holdin frame, and means to reciprocatesaid too holding frame.

6. In a bobbin borin machine, a frame carrying a series of bo binholders, means to feed bobbin blanks to successively aline with saidholders, means to bore said blanks, means to reciprocate said boringmeans toward and away from said frame, and means carried by said boringmeans and artaking of the reciprocating movement t ereof to successivelyengage the blanks and project same into said bobbin holders, and means40 for intermittently moving said bobbin holder frame to present thesuccessive holders to the feeding means and to the bobbin holding means.I

- 7. In a bobbin boring machine, a framecarrying a series of bobbinholders arranged in approximate circular order, a second frame, a seriesof spaced boring tools carried by said frame and arranged inapproximately circular order, means to rotate said bobbin holders, meansto operate said second frame, and a charging member carried by saidsecond frame and arranged to complete the circle nearly formed by saidboring tools,

and means for intermittently moving said bobbin holder frame to presentthe successive holders to the feeding means and to the bobbin holdingmeans,

" 8. In a bobbin boring machine, a series of bobbin holders arranged inregular order,

reciprocable boring means composed of a series of boring tools arranged1n the same order as said holders, means interposed between said holdersand boring means to feed blanks so as to successively aline with saidholders, means to operate said boring means,

there being a less number of boring tools than holders, and chargingmeans movable with said boring means and disposed opposite one of theholders, and means for intermittently moving said bobbin holder frame topresent the successive holders to the feedmg polnt and to the bobbinholding means.

9. In a bobbin boring machine, a rotatable frame carrying a series ofbobbin holders arranged in clrcular order, a second frame havingreciprocating movement toward and away from said rotatable frame aseries of boring tools and a charging rod carried by said second frameand arranged in order corresponding to that of said holders, said boringtools and said rod con'ointly bemg less in number than the num er ofholders, and means to actuate each of said frames.

10. In a bobbin boring machine, a rotatable frame carrying a series ofbobbin holders, means to rotate said frame, means to bore the bobbinblanks, means to successively feed the blanks to and roject the sameinto the front end of said holders, means to operate said holders fromthe rear thereof to lock the blanks in the holders, and a cam memberoperating independent of said holder operating means to engage the rear-of said holders and release the bobbin blanks.

11. In a bobbin boring machine, a rotatable frame carrying a series ofbobbin holders, means to successively automatically feed blanks to andsecuresame in said holders so as to be held against rotation, means to"rotate said frame and said holders, a cam member to' successively engageeach bobbin holder and permit the release of the completed bobbintherefrom, and means to bore said blanks.

12. In a bobbin boring machine, a frame having a series of bobbinholders, means to intermittently rotate said frame, a reciprocablenon-rotatable frame carrying a series of borin tools, a charging membercarried by sai frame and operable therewith to successively feed blanksto said holders, there being a less number of said boring tools thansaid holders, means to successively engage said holders andautomatically discharge a bored bobbin therefrom during the rotationthereof and prior to the holders being presented to said chargingmember, and means for reciprocating sald second frame.

13. In a bobbin boring machine, a stationary bar a rotatable framehaving a plurality of bobbin holders mounted on sald bar, anon-rotatable tool holder composed of a frame slidable on said bar andhaving a plurality of drills secured thereto, means to periodicallyactuate said rotatable frame,

means to actuate said tool holder frame, a charging rod carried by saidtool holder frame, and means to feed bobbin to a osition to be enga edby the char rod 2nd thrust thereby 1 nto the bobbin l il ers.

14:. In' a bobbinboring machine, a frame carrying a plurality 10f bobbinholders means or intermittently imparting partial rotation to saidframe, combined means for borini the bobbin blanks'and for engaging abobin blank to force the latter into one of said bobbin holders, means forfeeding a blankso that the latter will aline with said means for forcinsame into a bobbin holder and with sai bobbin holder, andmeans. forreciprocating said combmed means for boring the blanks and for engagingthe latter to forcesame into a bobbin holder.

15. In a bobbin boringbmachine, a frame.

carrying aplurality of bo bin holders, means for intermittentlyimparting partial rotation means to operate on t to said 'fr maa toolholder. carrying boring he blanks and bore Y same, means to feedibobbinblanks succes- I sively into the bobbin holders from the front thereof,means to o by en agement wit to loc the the rear ends thereoi,

to intermittently operate. said blank the successive means, and means toengage holders durin I 'In testimony whereof wehave signed our bobbinblanks said holder after same have been received therein means ckm therotation thereof forflnv locking Saidb anks from the bobbin holder.

names to this specification in the presence J

